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Fig. A.1


Observation and model fits after correcting for interstellar extinction. 2MASS: circles; VVV-DR1: stars; WISE: triangles pointing up; GLIMPSE: sails; MSX: squares; AKARI: diamonds; IRAS: crosses; upper limits: filled triangles pointing down; unconfirmed detection: open triangles pointing down; model: solid line (in case of two models, the solid line represents the brighter and the pointed line the fainter phase (see Sect. 3.2)).

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